Ultraviolet and optical observations of AG Draconis

Details Ultraviolet and optical observations of AG Draconis Ultraviolet and optical observations of AG Draconis

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..463l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Aug. 1987, p. 463-483.

Astronomy and Astrophysics

Astronomy

19

Astronomical Catalogs, Spaceborne Astronomy, Stellar Spectrophotometry, Symbiotic Stars, Ultraviolet Spectra, Visible Spectrum, Absorption Spectra, Iue, Line Spectra, Spectral Resolution

Scientific paper

IUE satellite observations and ground-based spectroscopic observations of the yellow symbiotic star AG Dra obtained at irregular intervals from 1975 to 1984 are presented. No forbidden lnes are observed in the optical, indicating a high density. The hydrogen emission lines often show a second blueshifted component that is not as strong as the main component. The He I and He II lines do not show a blueshifted component. AG Dra shows photometric variability with a period of 554 days (particularly below 4000 A) and radial-velocity variations with an amplitude of about 7 km/s which are consistent with a period of about 550 days. The N V line in the IUE region shows a P Cygni profile, indicating at least one region of outflow in the system. There may be some density stratification in the emission-line region(s).

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